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CVE

CVE-2021-31956

Microsoft Windows NTFS Privilege Escalation Vulnerability

Windows NTFS Elevation of Privilege Vulnerability.

HIGH · CVSS 7.8 ⚠ CISA KEV EPSS 0.88708
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

⬡

Weakness Classification

CWE-191Integer Underflow (Wrap or Wraparound)
CWE-191Integer Underflow (Wrap or Wraparound)
▤

Affected Products & Versions

16
microsoft windows 10 1507< 10.0.10240.18967
microsoft windows 10 1607< 10.0.14393.4467
microsoft windows 10 1809< 10.0.17763.1999
microsoft windows 10 1909< 10.0.18363.1621
microsoft windows 10 2004< 10.0.19041.1052
microsoft windows 10 20h2< 10.0.19042.1052
microsoft windows 10 21h1< 10.0.19043.1052
microsoft windows 7all versions
▣

Scoring & Timeline

7.8
HIGH · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD08 Jun 2021 · 11:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

2
cisaKEV-CVE-2021-31956
msrcCVE-2021-31956Elevation of Privilege
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31956PatchVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31956US Government Resource
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